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Adaptive event-triggered distributed optimal guidance design via adaptive dynamic programming

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Chinese Journal of Aeronautics 2022年第7期35卷 113-127页

作者： Teng LONG Yan cao Jingliang sun Guangtong XU School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Dynamics and Control of Flight Vehicle Ministry of Education ChinaBeijing 100081China Department of Precision Instrument Tsinghua UniversityBeijing 100084China

In this paper,the multi-missile cooperative guidance system is formulated as a general nonlinear multi-agent *** save the limited communication resources,an adaptive eventtriggered optimal guidance law is proposed by designing a synchronization-error-driven triggering condition,which brings together the consensus control with Adaptive Dynamic Programming(ADP)***,the developed event-triggered distributed control law can be employed by finding an approximate solution of event-triggered coupled Hamilton-Jacobi-Bellman(HJB)*** address this issue,the critic network architecture is constructed,in which an adaptive weight updating law is designed for estimating the cooperative optimal cost function ***,the event-triggered closed-loop system is decomposed into two subsystems:the system with flow dynamics and the system with jump *** using Lyapunov method,the stability of this closed-loop system is guaranteed and all signals are ensured to be Uniformly Ultimately Bounded(UUB).Furthermore,the Zeno behavior is *** results are finally provided to demonstrate the effectiveness of the proposed method.

关键词： Adaptive dynamic programming Distributed control Event-triggered Guidance and control Multi-agent system

Enhanced nitrogen removal upon the addition of volatile fatty acids from activated sludge by combining calcium peroxide and low-thermal pretreatments

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Journal of Environmental Sciences 2021年第10期33卷 145-151页

作者： Jiajun sun Junxue Song Wei Fang Hongbin cao Beijing Engineering Research Center of Process Pollution Control Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China China Xiong’an Group Ecological Construction Investment Co.Ltd. Baoding 071700China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Chemistry and Environmental Engineering China University of Mining and TechnologyBeijing 100083China

This study investigated a combined low-thermal and cao_(2)pretreatment to enhance the volatile fatty acid(VFA)production from waste activated sludge(WAS).The fermentative product was added to a sequencing batch reactor(SBR)as an external carbon source to enhance nitrogen *** results showed that the combined pretreatment improved WAS solubilization,releasing more biodegradable substrates,such as proteins and polysaccharides,from TB-EPS to LB-EPS and *** maximum VFA production of 3529±188 mg COD/L was obtained in the combined pretreatment(0.2 g cao_(2)/g VS+70℃for 60 min),which was 2.1 and 1.4-fold of that obtained from the sole low-thermal pretreatment and the control test,***,when the fermentative liquid was added as an external denitrification carbon source,the effluent total nitrogen decreased to Class A of the discharge standard for pollutants in rural wastewater treatment plants in most areas of China.

关键词： Waste activated sludge Anaerobic digestion Calcium peroxide Low-thermal pretreatment Volatile fatty acids

Experimental study and assessment of thermal energy storage mortar with paraffin/recycled brick powder composite phase change materials

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1301-1314页

作者： Luchen HAO Jianzhuang XIAO Wanzhi cao Jingting sun Department of Structural Engineering Tongji UniversityShanghai 200092China College of Civil Engineering Northwest Minzu UniversityLanzhou 730024China Postdoctoral Station of Mechanical Engineering Tongji UniversityShanghai 200092China

Thermal energy storage recycled powder mortar(TESRM)was developed in this study by incorporating paraffin/recycled brick powder(paraffin/BP)composite phase change materials(PCM).Fourier transform infrared and thermogravimetric analysis results showed that paraffin/BP composite PCM had good chemical and thermal *** onset melting temperature and latent heat of the composite PCM were 46.49°C and 30.1 J·g−*** fresh mortar properties and hardened properties were also investigated in this ***/BP composite PCM with replacement ratio of 0%,10%,20%,and 30%by weight of cement were *** results showed that the static and dynamic yield stresses of TESRM were 699.4%and 172.9%higher than those of normal mortar,*** addition of paraffin/BP composite PCM had a positive impact on the mechanical properties of mortar at later ages,and could also reduce the dry shrinkage of *** dry shrinkage of TESRM had a maximum reduction about 26.15%at 120 *** thermal properties of TESRM were better than those of normal *** thermal conductivity of TESRM was 36.3%less than that of normal mortar and the heating test results showed that TESRM had good thermal energy storage performance.

关键词： recycled powder mortar recycled brick powder thermal energy storage paraffin phase change material

Dynamic responses of a piezoelectric cantilever plate under high-low excitations

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Acta Mechanica Sinica 2020年第1期36卷 234-244页

作者： Xiangying Guo Shuaibo Wang Lin sun Dongxing cao College of Mechanical Engineering Beijing University of TechnologyBeijing100124China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Beijing100124China School of Mechanical Engineering Liaoning Shihua UniversityFushun113001China

In this paper,the nonlinear dynamic responses of a piezoelectric cantilever plate near the first-order and second-order natural frequencies under the action of electromechanical coupling are studied by experiments and finite element(FE)*** influence of different excitation frequencies on the dynamical characteristics of piezoelectric cantilever plates is analyzed with the fixed excitation ***,an experimental setup is built,including a carbon fiber cantilever plate attached to a macro fiber composite(MFC)***,the electromechanical coupling excitations are subjected to the plate with different frequencies,which are chosen near the first and second-order natural frequencies of the *** piezoelectric cantilever plate has periodical motions under a lower frequency excitation,and the motions of the plate become more complex after another high frequency excitation added in the physical *** experimental results show that the motion of the piezoelectric cantilever plate changes from stable to unstable with high-low coupled resonant *** last,the FE study is carried out to compare and verify the experimental results and the effects of isotropic and orthotropic materials on the accuracy of natural frequencies results are also compared.

关键词： Macro fiber composite Piezoelectric cantilever plate Dynamics Electromechanical coupling

Silicon chip-scale space-division multiplexing: from devices to system

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Science China(Information Sciences) 2018年第8期61卷 33-50页

作者： yu yu Chunlei sun Xinliang ZHANG Wuhan National Laboratory for Optoelectronics and School of Optical and Electrical Information Huazhong University of Science and Technology

Space-division multiplexing(SDM) technique has attracted increasing attentions recently, because it provides an effective way to increase transmission capacity. With the continuous and exponential increase in data demands, high-density integration of silicon photonic components is of significant interest in terms of link price, performance and power consumption. The multimode/mutlicore devices applied to achieve diverse functionalities are key building blocks to construct a chip-scale SDM system based on a silicon on insulator(SOI) platform. This study reviews the recent progress of multimode/multicore devices, which enable coupling, multiplexing/demultiplexing, transmitting switching, as well as modulation and *** on these devices, a complete on-chip SDM system is constructed and discussed.

关键词： integrated optics devices space-division multiplexing optical switching devices

The MADS-box transcription factor CmAGL11 modulates somatic embryogenesis in Chinese chestnut(Castanea mollissima Blume)

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Journal of Integrative Agriculture 2020年第4期19卷 1033-1043页

作者： GAO yue-rong sun Jia-chen sun Zhi-lin XING yu ZHANG Qing FANG Ke-feng cao Qing-qin QIN Ling Beijing Advanced Innovation Center for Tree Breeding by Molecular Design Beijing University of AgricultureBeijing 102206P.R.China Beijing Bei Nong Enterprise Management Co. Ltd.Beijing 102206P.R.China College of Plant Science and Technology Beijing Key Laboratory for Agricultural Application and New TechniqueBeijing University of AgricultureBeijing 102206P.R.China Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees Beijing University of AgricultureBeijing 102206P.R.China

Somatic embryogenesis(SE)is an effective approach of in vitro regeneration that depends on plant cell ***,largely unknown of molecular mechanisms of SE in woody plants such as Chinese chestnut(Castanea mollissima Blume),limits the development of the woody plant ***,we report the MADS-box transcription factor Cm AGL11 in Chinese *** AGL11 transcripts specifically accumulated in the globular *** of Cm AGL11 in chestnut callus enhanced its SE capacity,and the development of somatic embryos occurred significantly faster than in the ***-seq results showed that Cm AGL11 affects the expression of several genes related to the gibberellin,auxin,and ethylene ***,the analysis of DNA methylation status indicated that the promoter methylation plays a role in regulation of Cm AGL11 expression during *** results demonstrated that Cm AGL11 plays an important role in the SE process in Chinese chestnut,possibly by regulating gibberellin,auxin,and ethylene *** will help establish an efficient platform to accelerate genetic improvement and germplasm innovation in Chinese chestnut.

关键词： Chinese chestnut CmAGL11 somatic embryogenesis DNA methylation

Synthesis,Photochromism and Switchable Photoluminescence of a Cd-based Metalloviologen Complex

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Chinese Journal of Structural Chemistry 2021年第9期40卷 1177-1182,1109页

作者： sun Jing yu cao-Ming CAI Li-Zhen GUO Guo-Cong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemical Engineering Fuzhou UniversityFuzhou 350116China

A novel metalloviologen complex{[Cd(PhSQ)(HTBC)(H_(2)O)_(2)]·1.25 H_(2)O}n(1)based on N-(4-sulfophenyl)-4,4’-bipyridinium(PhSQ)and monoprotonated trimesic acid(HTBC)has been prepared and structurally *** 1 has been characterized by elemental analysis,IR,thermogravimetric analyses,UV-Vis spectra and X-ray *** coordination geometry of Cd(Ⅱ)ion is a pentagonal *** 1 displays a zigzag chain along the b axis,and such chains are extended into a 2 D layer supramolecular network through hydrogen bonding and π…π ***,complex 1 exhibits reversible photochromic and switchable luminescent behaviors via UV light irradiation at room temperature induced by the photogenerated radicals via a photo-induced electron transfer(PET)mechanism.

关键词： crystal structure metalloviologen photochromism switchable photoluminescence

Investigation on the performance and detoxification of modified low temperature coal tar pitch

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Frontiers of Structural and Civil Engineering 2017年第3期11卷 315-321页

作者： Fengyan sun yu LIU National Center for Materials Service Safety University of Science and Technology Beijing Beijing China

In this paper, studies on the modification on the low temperature coal tar pitch extracted from coal tar residue in Inner Mongolia are conducted. First, the low temperature coal tar pitch in liquid state is solidified with a higher softening point by chemical crosslinking modification. The modified coal tar pitch can achieve the standard pavement performance requirements. Then, the effects of chemical crosslinking agent and physical modification additives on the mechanical performance and toxic properties of coal tar pitch are investigated. The detoxification mechanism is also studied, which further promote the applicability of modified low temperature coal tar pitch in the pavement constructions.

关键词： coal tar pitch low ternpemture modification detoxification

A calculation method for a power user's CIC under specific conditions in smart distribution grid

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Science China(Technological Sciences) 2015年第7期58卷 1162-1172页

作者： sun Bing yu YiXin Key Laboratory of Smart Grid of Ministry of Education Tianjin University

This paper presents a practical method for calculating a power user’s customer interruption costs(CIC)under specific *** novel method has been developed,based on the CIC results predicted by Lawrence Berkeley National Laboratory(LBNL),so that the key factors,such as customer type,customer size,interruption occurrence time and interruption duration can be *** compared to the LBNL method,the method proposed here is easy to understand and easy to execute with an acceptable *** lays a solid foundation for further investigation of distributed generators and demand response in assessing reliability value of smart distribution grid(SDG).The effectiveness of the proposed method is confirmed through the assessment of RBTS-Bus2.

关键词： smart distribution grid reliability value customer interruption costs customer type customer size interruption oc-currence time interruption duration